CN112048668B - High-hardness steel for shield cutter and manufacturing method thereof - Google Patents
High-hardness steel for shield cutter and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 16
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching Effects 0.000 claims abstract description 12
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 11
- 230000000717 retained Effects 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 238000005242 forging Methods 0.000 claims description 29
- 238000000137 annealing Methods 0.000 claims description 13
- 238000009792 diffusion process Methods 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 238000010274 multidirectional forging Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 3
- 238000009849 vacuum degassing Methods 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 14
- 238000002360 preparation method Methods 0.000 abstract description 5
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000010936 titanium Substances 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
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- 238000007599 discharging Methods 0.000 description 3
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- 238000005496 tempering Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910000529 magnetic ferrite Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
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- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
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- 239000002436 steel type Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 210000001519 tissues Anatomy 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium(0) Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The invention relates to a high-hardness steel for a shield cutter and a preparation method thereof, belonging to the field of alloy steel manufacture. 0.40-0.60% of C, 0.80-1.20% of Si, 0.20-0.60% of Mn, 4.00-6.00% of Cr, 1.10-1.30% of Mo, 0.45-1.0% of V, 0.30% of Ni, 0.10-0.60% of Ti, and the balance of Fe and inevitable impurity elements, wherein the content of the impurity elements S is less than or equal to 0.005%, and the content of P is less than or equal to 0.020%. The high-hardness steel for the shield cutter is forged, carbon is distributed to the retained austenite by adopting quenching and distribution heat treatment processes, and finally a stable complex phase structure of martensite and retained austenite at room temperature is obtained, the hardness can reach more than 55HRC, the impact energy at room temperature exceeds 28J, the tensile strength is more than 1800MPa, and the high-hardness steel has a good obdurability ratio. The obtained cutter steel has excellent impact resistance, the process flow is simple, the production period is shortened, the energy is saved, the environment is protected, the cost is reduced, and the enterprise competitiveness is improved.
Description
Technical Field
The invention relates to alloy steel and a manufacturing method thereof, in particular to high-hardness steel for a shield cutter and a preparation process thereof, belonging to the technical field of alloy steel manufacturing processes.
Technical Field
The shield machine is a construction machine widely applied to underground engineering and tunnel driving in recent years, a shield cutter is a key part for breaking rocks of the shield machine, is a tooth of the shield machine and is also a part of the shield machine directly contacted with a tunnel face, the working condition is severe, the stress is complex, the loss is extremely large, and the performance and the service life directly influence the construction effect and the construction efficiency of the underground engineering. Therefore, the tool steel material is required to have sufficient strength, high hardness, and good toughness.
The conventional shield cutter steel in China is 5Cr5MoSiV1, the material has the advantages of relatively good hardness and strength, and the main defect is that the toughness and the hardness cannot be well considered, and the toughness is just one of key performance indexes influencing the quality and the service life of the cutter, so that the cutter is easy to crack and lose in the working process, and the stability and the efficiency of production are severely restricted. In addition, at present, domestic high-end shield cutter steel mainly depends on import, such as German Vilter steel type X50CrVMo5-1 steel, American Robbins cutter steel and the like, and huge cost is brought.
Therefore, the research and development work of matching the cutter material with good hardness and toughness is actively carried out, which is beneficial to breaking the monopoly abroad, and the method makes a strong contribution to accelerating the construction of subways and railway tunnels in China, improving the technical level in China, reducing the construction cost and making key parts of the development machine into the localization.
Chinese patent application CN 108486499A discloses 'steel for shield machine cutter and manufacturing method thereof', which comprises the following components by mass percent: 0.40-0.60% of C, 0.80-1.20% of Si, 0.20-0.60% of Mn, 4.00-6.00% of Cr, 1.10-1.30% of Mo, 0.45-1.0% of V, 0.30% of Ni, 0.1-0.6% of Ti, less than or equal to 0.020% of P, less than or equal to 0.005% of S, less than or equal to 0.01% of B, and the balance of Fe and inevitable impurities. The production process flow of the shield machine cutter steel is as follows: smelting, casting, electroslag remelting, three-dimensional refining uniformity and FM method forging, annealing and superfine treatment, and finally preparing the shield machine cutter steel with good toughness, rigidity and wear resistance. The mechanical property of the product is similar to that of the product, but the process is simple, the cycle is shortened, the energy is saved, and the cost is reduced.
Disclosure of Invention
Aiming at the problems, the invention provides the high-hardness steel for the shield cutter and the preparation process thereof by reasonably adjusting and optimizing chemical components and proportion and designing a reasonable heat treatment process. Specifically, the invention aims to increase the impact toughness of the shield steel and change the final phase composition of the material. After forging, a quenching-partitioning heat treatment process is adopted to partition carbon from supersaturated martensite to residual austenite, so that the toughness of the shield cutter steel is greatly improved. A titanium-containing shield cutter steel is developed, and a preparation method of the steel is provided.
The invention is realized by the following technical scheme:
the high-hardness steel for the shield cutter is characterized by comprising the following raw materials in percentage by mass: 0.40-0.60% of C, 0.80-1.20% of Si, 0.20-0.60% of Mn, 4.00-6.00% of Cr, 1.10-1.30% of Mo, 0.45-1.0% of V, 0.30% of Ni, 0.10-0.60% of Ti, and the balance of Fe and inevitable impurity elements, wherein the content of the impurity elements S is less than or equal to 0.005%, and the content of P is less than or equal to 0.020%.
The manufacturing method of the steel for the high-hardness shield cutter is characterized by comprising the following steps of:
step 1, steel making: putting the raw materials into an electric furnace for smelting, refining and vacuum degassing, and then casting into ingots;
step 2, high-temperature diffusion annealing: carrying out high-temperature diffusion annealing on the cast ingot; (ii) a
Step 3, forging: forging the ingot subjected to high-temperature diffusion annealing to form a forging stock;
step 4, heat treatment: the forged billet is austenitized in an electric resistance furnace, then salt-bath quenched to a temperature between the martensite start temperature (Ms) and the martensite finish temperature (Mf), and held at a quench stop Temperature (TQ) or slightly higher partitioning Temperature (TP) for a suitable time to partition carbon from supersaturated martensite into retained austenite, thereby stabilizing to room temperature.
Further, in the step 2, the high-temperature diffusion annealing temperature is 1250-1280 ℃, the heat preservation time is at least D/50+8 hours, and D is the numerical value of the diameter of the ingot measured by millimeters.
Further, in the step 3, the preheating temperature of the anvil for forging is 200-250 ℃, and the ingot is subjected to multidirectional forging processing within the temperature range of 1100-1200 ℃; the final forging temperature is more than or equal to 900 ℃.
Further, in the step 4, the austenitizing temperature is 1000-1100 ℃, then the salt bath quenching is carried out to 200-300 ℃ for 25-35s, and then the distribution and heat preservation are carried out for 25-35min at 350-450 ℃.
In the prior art, the shield cutter steel 5Cr5MoSiV1 comprises, by mass, 0.48-0.52% of C, 4.50-5.00% of Cr, 1.10-1.30% of Mo, 0.80-1.20% of V, 0.90-1.10% of Si and 0.30-0.50% of Mn. The main preparation process is forging, spheroidizing annealing, quenching and tempering. The invention aims to invent shield cutter steel with higher obdurability to replace 5Cr5MoSiV1, and the invention takes the advantages of each element, avoids the shortages thereof, reasonably adjusts and optimizes chemical components and mixture ratio to obtain a new good alloy mixture ratio, and the following are considered in important points:
(1) the function of the C element: carbon element is one of the main elements of the steel for the high-hardness shield cutter, is the most effective element for improving the hardness and the strength of the steel, also influences the component segregation and the structural uniformity of the steel, and simultaneously, various carbides such as chromium, molybdenum, vanadium and the like which are separated out during tempering and play a role in dispersion strengthening are the basic standards for reaching indexes of the performance of the steel for the shield cutter. Meanwhile, the proper reduction of the content can prevent the steel from generating segregation structure in the solidification process, thereby causing the non-uniformity of the hardness of the steel and the toughness of impact.
(2) Function of Mn element: mn is a weak deoxidizer, and a proper amount of Mn can effectively improve the strength of steel, eliminate the influence of sulfur and oxygen on the hot brittleness of the steel, improve the hot workability of the steel, improve the cold brittleness tendency of the steel, and not obviously reduce the plasticity and impact toughness of the steel. However, an excessively high Mn content (up to 1.0 to 1.5% or more) makes the steel brittle and hard, and reduces the rust resistance and weldability of the steel.
(3) Function of Si element: the element is used as a non-carbide forming element, the strengthening effect of a matrix is not obvious under a complex working environment requiring high hardness and wear resistance, and meanwhile, the silicon element can reduce the toughness of the material and is not particularly added as an alloy element; therefore, the content of silicon element is properly reduced in the present invention.
(4) The content of Cr element: the chromium element can strongly delay the pearlite transformation and is beneficial to improving the hardenability of the material and the tempering stability of martensite, but because the carbide of the chromium element is easy to coarsen and has a certain harmful effect on the toughness, the content of the chromium element is properly controlled in the invention, and the range is controlled to be the lower limit of 5Cr5MoSiV 1.
(5) The function of the V element: as a deoxidizer for steel, the deoxidizer can obviously refine structure grains when reaching more than 0.5 percent, improve the strength and toughness of the steel, and improve the corrosion capability (H corrosion) of the steel at high temperature by forming carbide with C.
(6) Function of Ti element: a small amount of Ti element is added, so that the effects of precipitation strengthening and fine grain strengthening can be achieved, the growth of crystal grains is inhibited, and the strength of the steel is improved. Meanwhile, a certain amount of Ti element is added into the steel, so that the corrosion resistance can be improved.
(7) Function of Ni element: ni can refine ferrite grains, improve ductility and toughness of steel, enhance hardening performance of steel, and reduce quenching temperature during heat treatment, so that deformation is small during heat treatment.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) through reasonable component design and process control, the hardness of the shield cutter steel is more than or equal to 55HRC, and the impact toughness is more than or equal to 28J/cm2The tensile strength is more than or equal to 1800 MPa.
(2) The structure type of the shield cutter steel manufactured by the invention mainly comprises martensite and retained austenite, and composite phase precipitates containing Cr, Mo, V, Ti and the like, so that the shield cutter steel plays a role in precipitation strengthening, does not deteriorate plasticity and toughness while improving the hardness, has good comprehensive mechanical properties, and meets complex geological working environments.
(3) The method utilizes the quenching-distribution process to prepare the shield machine cutter steel, introduces the residual austenite phase, improves the toughness of the material, and increases the fatigue resistance of the material. Has excellent combination of strength and toughness, and the shield cutter steel has small deformation after heat treatment. The method can be popularized in certain steel enterprises with heat treatment lines, and lays a foundation for realizing the conversion of shield cutter steel products of the enterprises to the directions of higher hardness and high toughness.
Drawings
FIG. 1A forged microstructure (a) and a heat-treated microstructure (b) in example 1 of the present invention,
figure 2 microstructure after heat treatment according to example 2 of the invention,
figure 3 microstructure after heat treatment according to example 3 of the invention,
FIG. 4 microstructure after heat treatment according to example 4 of the present invention.
Detailed Description
Example 1:
smelting, casting and forging are carried out according to the component ranges, and then the components of the forging stock are detected, wherein the components are shown in the table 1.
TABLE 1 composition of the forgings (wt.%)
The forging adopts the following process: preheating the anvil for forging at 200-250 ℃, and carrying out multidirectional forging processing on the cast ingot at the temperature of 1100-1200 ℃; the final forging temperature is more than or equal to 900 ℃, and the tissue types are ferrite and pearlite at the time, as shown in figure 1 (a). And (3) heat treatment: heating the test steel to 1050 ℃ and preserving heat for 30min, then quenching the test steel to 200 ℃ in a salt bath, then putting the test steel into a 350 ℃ resistance furnace for preserving heat for 30min, discharging the test steel out of the furnace and air cooling, wherein the structure type is martensite and retained austenite at the moment as shown in figure 1 (b).
TABLE 2 mechanical Properties of Shield steels
Example 2: smelting, casting and forging are carried out according to the component ranges, then the components of the forging stock are detected, and the component 2 is shown in the table 3.
TABLE 3 composition of the forged stocks (wt.%)
The steel was produced in the same manner as in example 1, and the heat-treated structure is shown in FIG. 2.
TABLE 4 mechanical Properties of Shield steels
Example 3: the steel composition of this example was the same as that of example 1. The manufacturing method of the steel comprises the following steps:
the forging adopts the following process: preheating the anvil for forging at 200-250 ℃, and carrying out multidirectional forging processing on the cast ingot at the temperature of 1100-1200 ℃; the final forging temperature is more than or equal to 900 ℃. And (3) heat treatment: heating the test steel to 1050 ℃ and preserving heat for 30min, then quenching the test steel to 150 ℃ in a salt bath, then putting the test steel into a 350 ℃ resistance furnace for preserving heat for 30min, discharging the test steel out of the furnace and air cooling, wherein the structure type is martensite and retained austenite, and the structure is shown in figure 3.
TABLE 5 mechanical Properties of Shield steels
Example 4: the steel composition of this example was the same as that of example 1. The manufacturing method of the steel comprises the following steps:
the forging adopts the following process: preheating the anvil for forging at 200-250 ℃, and carrying out multidirectional forging processing on the cast ingot at the temperature of 1100-1200 ℃; the final forging temperature is more than or equal to 900 ℃. And (3) heat treatment: heating the test steel to 1050 ℃ and preserving heat for 30min, then quenching the test steel to 200 ℃ in a salt bath, then putting the test steel into a 400 ℃ resistance furnace to preserve heat for 30min, discharging the test steel out of the furnace and air cooling, wherein the structure type is martensite and retained austenite, and the structure is shown in figure 4.
TABLE 6 mechanical Properties of Shield steels
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (4)
1. The high-hardness steel for the shield cutter is characterized by comprising the following raw materials in percentage by mass: 0.40-0.60% of C, 0.80-1.20% of Si, 0.20-0.60% of Mn, 4.00-6.00% of Cr, 1.10-1.30% of Mo, 0.45-1.0% of V, 0.30% of Ni, 0.11-0.60% of Ti, and the balance of Fe and inevitable impurity elements, wherein the content of impurity elements S is less than or equal to 0.005%, and the content of P is less than or equal to 0.020%;
the manufacturing method of the steel for the high-hardness shield cutter is characterized by comprising the following steps of:
step 1, steel making: putting the raw materials into an electric furnace for smelting, refining and vacuum degassing, and then casting into ingots;
step 2, high-temperature diffusion annealing: carrying out high-temperature diffusion annealing on the cast ingot;
step 3, forging: forging the ingot subjected to high-temperature diffusion annealing to form a forging stock;
step 4, heat treatment: the forged blank is placed in a resistance furnace to be austenitized at 1000-1100 ℃, and then salt bath quenching is carried out to the martensite start temperature (M)s) And martensite stop (M)f) The temperature between 200 ℃ and 300 ℃ is kept for 25-35s and the quenching stop temperature (T)Q) Or slightly higher partition temperature (T)P) Keeping at 350-450 deg.C for 25-35min to make carbon from supersaturated horseThe martensite partitions into the retained austenite and is thus stabilized to room temperature.
2. The method for manufacturing the steel for the high hardness shield cutter according to claim 1, characterized by comprising the steps of:
step 1, steel making: putting the raw materials into an electric furnace for smelting, refining and vacuum degassing, and then casting into ingots;
step 2, high-temperature diffusion annealing: carrying out high-temperature diffusion annealing on the cast ingot;
step 3, forging: forging the ingot subjected to high-temperature diffusion annealing to form a forging stock;
step 4, heat treatment: the forged blank is placed in a resistance furnace to be austenitized at 1000-1100 ℃, and then salt bath quenching is carried out to the martensite start temperature (M)s) And martensite stop (M)f) The temperature between 200 ℃ and 300 ℃ is kept for 25-35s and the quenching stop temperature (T)Q) Or slightly higher partition temperature (T)P) And maintained at 350-450 deg.c for 25-35min to distribute carbon from the supersaturated martensite into the retained austenite for stabilization to room temperature.
3. The method for manufacturing the steel for the high-hardness shield cutter according to claim 2, wherein in the step 2, the high-temperature diffusion annealing temperature is 1250 to 1280 ℃, the holding time is at least D/50+8 hours, and D is a value of the ingot diameter measured in mm.
4. The method for manufacturing the steel for the high-hardness shield cutter according to claim 2, wherein in the step 3, the preheating temperature of the anvil for forging is 200 to 250 ℃, and the ingot is subjected to multidirectional forging processing at a temperature ranging from 1100 to 1200 ℃; the final forging temperature is more than or equal to 900 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010881999.0A CN112048668B (en) | 2020-08-28 | 2020-08-28 | High-hardness steel for shield cutter and manufacturing method thereof |
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| CN115449694A (en) * | 2022-08-22 | 2022-12-09 | 成都先进金属材料产业技术研究院股份有限公司 | Shield machine cutter and production method thereof |
| CN115446330A (en) * | 2022-09-09 | 2022-12-09 | 山东建筑大学 | Method for preparing high-strength and high-toughness shield cutter by using 3D printing technology |
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